:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #6e6e73; --link: #0066cc; --line: #d2d2d7; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #161617; --fg: #f5f5f7; --muted: #a1a1a6; --link: #4da3ff; --line: #3a3a3c; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
header img { width: 72px; height: 72px; }
h1 { margin: 0; font-size: 32px; }
h2 { margin-top: 32px; font-size: 21px; }
p.lead { color: var(--muted); margin: 4px 0 0; }
a { color: var(--link); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }